If this is done you can register your scriptfiles like you did before with Yii::app()->clientScript->registerScriptFile() and it will create the packed and minified javascript files in the assets folder. Your original JS files will stay untouched. If you want to re-pack the files just delete the files from your assets folder. I extended the registerScriptFile and it accepts an array as well with multiple js files.

IMPORTANT! You need to pass the path relatively to your `$_SERVER['DOCUMENT_ROOT']` to the registerScriptFile method.

If you experience any problem please give me a shout.
I removed the caching because it didn't work well with the assets. The minify option is off by default because it can really slow down things. I need to rework this extension just need to find to do it.